Add gate adapter snapshot consistency regressions

backend/services/infonet/tests/test_gate_adapter_snapshot_consistency.py

@@ -0,0 +1,29 @@
+"""Regression coverage for consistent gate-adapter chain snapshots."""
+
+from services.infonet.adapters.gate_adapter import InfonetGateAdapter
+
+
+def _counting_adapter():
+    calls = {"count": 0}
+
+    def chain_provider():
+        calls["count"] += 1
+        return []
+
+    return InfonetGateAdapter(chain_provider), calls
+
+
+def test_suspension_state_samples_chain_once():
+    adapter, calls = _counting_adapter()
+
+    adapter.suspension_state("never-seen")
+
+    assert calls["count"] == 1
+
+
+def test_shutdown_state_samples_chain_once():
+    adapter, calls = _counting_adapter()
+
+    adapter.shutdown_state("never-seen")
+
+    assert calls["count"] == 1